The nice!60 is a standard 60% ANSI hotswap PCB offering BLE using the nRF52840 chip. The nice!60 is compatible with a wide range of 60% keyboard cases (Including the tofu) as it offers a standard 60% sizing and mounting points.
The nice!60 is powered through ZMK, and while setup may take a little longer, the ZMK platform is powerful and great for low energy power usage.
Please take a look at the getting started guide for more information.
To run your nice!60 wirelessly, you need a battery. In specific, you need a 3.7v rechargeable lithium battery that is at least 500mAh large. Note when choosing a battery, the recharge rate is 500mA, so a 2,000mAh battery will take about 4 hours to charge. You'll want a battery that uses a 2-pin JST-PH (2.00mm) connector to properly attach the battery to the nice!60. While this is the most common connector type for hobbyist lithium batteries, double check that it's the right kind.